The Hindu, Buddhist and Jain pilgrim centres of Nalanda, Pawapuri, Rajgir, Bodh Gaya and Vaishali are all near Harnaut.

Harnaut has a humid subtropical climate in the Köppen climate classification: (Cwa) with hot summers start from early-March to late-June, the monsoon season starts from July to late-August and chilly winter nights and foggy or sunny days from November to February.

In 2016, the Government of Bihar issued a draft order converting Harnaut into a Nagar Panchayat combining nine villages - Sabnahua, Rupuspur, Porai, Cheran, Basti, Srichandpur and Dihri.

[7] The incumbent chief minister of Bihar, Mr. Nitish Kumar, has been elected many times as MLA from Harnaut legislative assembly seat.

[citation needed] Agriculture is the primary activity although tourism in nearby places like Nalanda, Rajgir and Pawapuri boosts economy of this town.

[citation needed] This town supplies agricultural products like cauliflower, potato, mustard seed and other vegetables to neighbouring states.

[citation needed] Although the economy is mainly based on agricultural products, garments are also manufactured in household industries.

Bhelpuri a snack which is a meld of papadis, puffed rice, sev, onions, potatoes, tomatoes, chillies, coriander leaves and chutneys.

Kachori with jalebi, Litti (cuisine), samosa, chaat, chole bhature delicious street foods of Harnaut.

Paratha, aloo gobi, baingan bharta, naan, palak paneer, Rajma are the special cuisine of city.

Similarly, NH 31 connects it to Ranchi via Hazaribagh, Barhi, Nawada, and to northeastern India from Mokama, Purnia, Kishanganj up to Guwahati.

Harnaut is connected with the major cities in India like New Delhi, Mughalsarai, Lucknow, Asansol, Howrah by the Howrah-Delhi Main Line with daily passenger, express and super fast trains services.